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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db4e06513acac6555a8be54589c6e12565d308c8d7ab8a5f547a6e75e6ef48e' 
  AND token = 'r0dQh4i9j/qWFF0fZcjTVbwuWAiAy1qMCuqVTHCQB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}